Manual
CDB5521/22/23/24/28
DS317DB2 7
CS
R1
1
200
Ω
SDI
R2 2
200
Ω
SDO
R3 3
200
Ω
SCLK
R4
4
200
Ω
A0
R5 5
200
Ω
A1
R6 6
200
Ω
18
Y1
11.0592MHz
19
C23
33pF
C0G
C24
33pF
C0G
9
+5V Digital
40
+5V Digital
39
R13
10k
Ω
+
18
+
27
+
36
+
45
R12
5.11k
Ω
R11
5.11k
Ω
R10
5.11k
Ω
14
13
12
11
10
C7
47µF
C17
0.1µF
+
Test Switch 1
Test Switch 2
Test Switch 3
21
22
23
24
S1
D1
LED_555_5003
RESET
COMM
GAINCAL
OFFSETCAL
JP2
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
XTAL1
XTAL2
C19
0.1µF
Bypass
Cap
RESET
+5V Digital
R9
750k
Ω
C18
0.1µF
D4
1N4148
RST
VSS
20
VDD
P0.0
P3.0
P3.1
P3.2
P3.3
P3.4
P2.0
P2.1
P2.2
P2.3
From RS-232
TXD
RXD
TP71
TP72
16
15
14
13
12
11
Normal
Loopback
C28
10µF
+
24
U1
MC145407
C27
10µF
+
3
1
C25
10µF
+
18
20
5
6
7
8
9
10
C2-
C2+
C1-
C1+
VCC VDD
17
+5V Digital
C26
10µF
+
R14
10k
Ω
5
6
7
8
4
1
9
3
2
RI
TXD
RXD
RTS
CTS
DTR
DSR
DCD
UM1
80C51
From
Figure 1, 2
CS
SDI
A1
A0
SCLK
SDO
HDR6
To RS-232
HDR7
19
Figure 3. Digital Section